Fuse



Feb. 27, 1923. 1,447,150

w. N. PIERCE ET Al.

FUSE

l Filed June lo, 1920 ma. 2405@ a Patented Feb. 27, 1923.

UNITED STATES PATENT OFFICE.

WILLIAM N. PIERCE .AND BERTRAM C. CANDEE, OF BUFFALO, NEW YORK, ASSIGNOBS lI'O PIERCE FUSE CORPORATION, 0F BUFFALG, NEW YORK, A CORPRATION 0F 'NEW YDRK.

FUSE.

.Application led June 10, 1920. Serial No. 387,820.

To all lwhom it may concern:

Be it known that we, WILLIAM N. PIERCE and Bnn'rnAM C. CANDEE, citizens of the United States, residing at Buffa-lo, in the county of Erie and State of New York, have invented new and useful Improvements in Fuses, of which the following is a specification.

This invention relates to a fuse of the rellable ferrule type and it is the object of this invention to provide a fuse of this character which is strong and durable, easily refilled and not liable to bev injured when the fuse blows out.

In the accompanying drawings: Figure 1 is a longitudinal section of a fuse embodying our invention. Figures 2 and 3 are vertical transverse sections of the same taken on the correspondingly-numbered lines' in Fig. 1.

Similar characters of reference indicate corresponding parts in the several views.

10 and 11 represent the inner and outer tubular sections of insulating material form` ing the body of the enclosing casing of the fuse, the inner section being provided in its side with an opening 12 for the introduc` tion of the fuse link 13 into the casing. T his opening may be covered and uncovered bv siidin the two casing sections lengthwise relatively to one another.

wWithin opposite ends of the inner casing section are arranged two metal bushings 14. 15 of cup-shaped form and having their concave sides facing outwardly. In their inner or convex sides the bushings are provided with attaching lugs 16, 17 to which the opposite ends of the fuse link may be detachably connected either by screws 18, as shown in F ig. 1, or by an i other suitable means. Each of the bus ings is permanently secured to the adjacent end of the inner casing section by a pin 19 passing transversely through the same and having its ends riveted over the outer side of the inner casing section.

The head at the inner end of each bush ing is preferably provided with one. or more vent openings 20 arranged on one side of the adjacent fuse attaching lug. On its outer end the bushing 15 is provided with an external annular iange 21 which .pro jectslaterally across the adjacent ends of the inner and outer casing sections. Fitting over this flange and the respective end ofthe outer casing section is a metal cap 22 4which ably provided with one or more vent openings 25 which are arranged out of line with the openings 20 in the respective bushing and ermit the escape of gases from the interior of the casing when a fuse link blows.

The other bushing 14 has its outer end projecting beyond the adjacent end of the inner and outer casing sections and provided with an external screw thread 24. This thread is engaged by an internally screw threaded disk or ring 26 which extends across the adjacent ends of the inner and outer casing sections.

27 represents a metal cap the head of which engages the outer side of the bushing 14 and the disk thereon while its flange fits over the edge of said disk andthe adjacent end ot the outer casing section. This cap is preferably secured to the disk b brazing and also by indentations or puncli marks 28 formed in its dange and entering the edge ot the disk, and similar prick punches or spurs 29 are produced in` the ilange of this cap 'which` interlock with the outer casing section, as shown in F ig. l. The head of the last mentioned cap is also provided with or more vent openings 30 which ar'e out of line with the vent open-V ings 20 in the companion bushing and permit the escape of gases due to melting of a fuse link. y

The flame produced when a fuse blows is prevented from reaching the exterior of the fuse by screens preferably made of gauze or woven wire in 'the form of cups and each engaging its head 31 with the outer side of the adjacent pin 19 while its flange 32 bears against the bore of the respective bushing.

When the fuse is in its normal working condition., the disk 26 and cap 27 which in etl'ect are practically one piece are interiocked with the inner casing section by the screw joint between this disk and the adjacent bushing` thereby securely holding the 

